Gray fullbuster was not prepared.
Natsu knew Gray wasnt prepared, thus why he was doing it now. So he would be unprepared and not as surprised when the rest of the houses secrets get revealed.

"Go straight." Natsu commanded moving a bookshelf to reveal some tunnels.

"As someone who's unsure of thier sexuality, that is not possible." Gray sassed Natsu with an amused look on his face.

"Aye, I'm the gayest fuck alive now walk dammit. I swear it's worth it." Natsu felt a small bliss form inside his chest. He assumed it was from the lack of fighting between the two good friends and nothing else.

Gray raised an eyebrow and sighed externally. Internally was a diffrent story. Still in a wonderus mood, he had a plan. To advance forward but in the least straight way possible and as dramatic as possible. Without embarassing himself that is. Gray did have dignity and self respect topped off with personal boundries.

Gray spun around zigzagging through the dank halls while he heard Natsu laughing from behind him. Gray stopped and turned arpund to see Natsu loosing it.

Natsu was laughing so hard he was coughing, doubbled over swaying side to side. His eyes were closed but you could see tears leaking out as he wheezed.
Gray grasped Natsu's shoulder.
Natsu came eye level his eyes bright, face showing the pure bliss from before. Natsu kept smiling and giggling unaware of how close he was to gray.

Gray's body froze, he had no idea what was happening. He enjoyed the look of bliss and excitement on Natsu's face. He felt like he should do something, unknowing what to do, he thought about what was happening.

Natsu's and Gray's faces were inches from eachother. Gray flushed, nobody has been this close to his face. Nobody but Natsu. Still frozen and confused, he noticed that Natsu had finally calmed down from his hysterical laughter.

Gray wanted to, no, needed to protect that smile and laugh. He didn't want to see Natsu hurt.
Gray found it harder to bring himself to annoy or anger the pyro, or be mean even as of late. Gray assumed it was because they were acting less and less like rivals and more like the bestfriends of years that deep down, they were.
Don't take it wrong, they're not mushy and gushy with eachother and they do still call ecachother names and brawl, and tease, but its not serious like some previous things had been.

There had been times where Gray genuinely upset Natsu, or when thier punches had been real.  But that all seemed like a distant nightmare now.

Creating more distance between them, Gray snapped out of his thoughts.
"Hey Natsu, what was it that you wanted to show me?"

"I'll show you!" Natsu grinned, grabbed a loop hole of Grays jeans and dragged him down the hall with a left, a right then lastly another left.
Gray had protests to being pulled by his pants, not wanting them to falloff since he already was Shirtless again.

Natsu stopped in a large cave like room. There were pillows, blankets, celing to floor curtains (dispite there being no windows).

The only sorce of light were some lanterns and fairy lights, dimly lighting a wall littered with photoboth pictures that team Natsu had taken or other random pictures with the team.

There was a picture of Erza fighting with Mira back in the day, another depicted Natsu as an IceBall with an unconcious gray slung with him. Gray didnt feel particularly flatterd from that picture
Another was Natsu and Juvia standing over a sleeping Gajeel who had marker all over his face
One was Gajeel and Natsu, looked like Natsu took it with Gajeel off guard.
One Natsu was in Laxus' cloak.
Another 5 or so with Lucy, 7 more with Gray (all at extremely unflattering angels), some were just good ol memories that didnt even have Natsu in it. Some had Lisana or Guildarts or Wendy.
A few had Erza in some pictures she would want burned. (Ie;  baking)
Gray was flattered by how many pictures he himself were in. Happy had a decent amount too but that was no surprise.
Natsu basically had pictures with all his friends. Gray always knew Natsu was secretly the sentimental type.
Gray's favorite one though, was  the one of Team Natsu right after thier fight with phantom lord.

"Welcome to the Natsu cave." Natsu threw himself onto a bunch of pillows.

"Nice place, Ya sentimental bastard." Gray laughed gesturing to a pair of Gray's underwear Natsu stole the day Lucy joined in the corner.

"Thanks..uh you can have that back, i meant to give that back." Natsu rubbed his neck burrowing back into his scarf that Gray rudely stole earlier to entertain Natsu with.

"Liar.' Gray snorted flopping down next to Natsu.

"Plus my size is always Fluxuating." Gray shrugged.

"What?" Nastu kept his voice steady.

"What?" Gray asked back in defense.

"Anyways want to do something?" Natsu turned himself into a burrito of blankets.

"Sure, what?" Gray stole a blanket.

"Dunno, up to you." Natsu sipped some tea.

Gray grinned.